过渡或渐缩管道。可指定过渡类型。
Transitioning or reducing duct. Type of transition can be specified.
偏移过渡或渐缩管道。可指定过渡类型。
Offset transition ing or reducing duct. Type of transition can be specified.
金鲫鱼是由鲫鱼演化成金鱼的最原始的中间过渡类型。
The goldfish is evolves goldfish's most primitive middle transitional form by the carp .
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